Site-to-site vpn, need help, urgent!!

Need to create site-to-site vpn tunnel between cisco pix 501 (6.3(5)) and Watchguard X550E
I've got the how-to for the watchguard and a pix v7 or higher and the pix at this end is a v6.3(5)
Some commands will not work
I'm going mad googling this and also searching on the cisco and watchguard sites
Is now getting very urgent
I need help, either pointing to a link or transcribing the commands from pix v7 to v6.3
I've followed the instructions changing the commands as needed but im now stuck at the end of phase1 where i have to set the attributes for ipsec, the command reads ... tunnel-group <remote ip address> type ipsec-121
what would be the equivalent for this command?

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